General layout of an underground coal gasifier. Note: not to scale;
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Coal - Wikipedia
Underground Coal Gasification (UCG), its Potential Prospects and its Challenges
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3D model of a modular UCG to GTL plant (Linc Energy, 2013b).
Underground Coal Gasification
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A new indicator for estimating the degree of mining-induced land subsidence: the overburden's average GSI value
Evidence of coal conversion in the Majuba underground coal gasification pilot plant, South Africa
Study of the mechanical characteristics of coal-serial sandstone after high temperature treatment under true triaxial loading
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PDF) Unconventional Oil Production From Underground Coal Gasification And Gas To Liquids Technologies